Answer :

Given DE||BC and AD = 6cm, DB = 9cm and AE = 8 cm

Required: AC = ?

Here, DE||BC, ∴ By Thales theorem

∴

⇒

⇒

⇒

∴ EC = 12cm

∴ AC = AE + EC = 8 + 12 = 20cm

∴ Length of AC = 20cm

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